Changes

Based on the fees paid, we can determine the validity of a patent. Each fee is coded and the DaysIncrement variable indicates how many more days a patent is valid for after that fee is paid. The DaysDuration is how many total days the patent has been valid for since it's grant date. DaysDuration is the key variable, for each fee paid, we add DaysIncrement to DaysDuration. The DaysDuration past the grant date is the validity of the patent. ( NOTE: This version does not seem distinguish when to distinguish counting count from filedate or grant date, - it only seems uses grantdate. Prior to do it XXX (TO BE FILLED IN BY AVESH), patents had statutory terms of 18 yrs from grantdate) {note grant. Subsequent to self: find when XXX patents have 20 years from application.